Add changeset

Author: eddeee888

.changeset/funny-jokes-joke.md

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+---
+'@graphql-codegen/near-operation-file-preset': patch
+---
+
+Deduplicate `externalFragments` by name when multiple source documents are merged into the same generated output
+
+Why: multiple documents can resolve to the same generated file and each contribute the same external fragment
+downstream plugins then receive repeated externalFragments, which can cause severe perf blow-ups
+
+Relates to: https://github.com/dotansimha/graphql-code-generator-community/issues/752